I think he has proved to the coaches that he can read defenses. I think we all see one problem is his accuracy and completion %, he improved some last year but 60% needs to go to 67% unless, unless he is just making a lot of timely superb throws.. And his other main problem are the 4 or 5 WTF interceptions he has each year. He had 10 INTs last year and about 5 were bad, the one at MInny right b4 halftime, of course the miscommunication at the end of the PSU game, and a couple just bad throws or throwing to too tightly covered a receiver.
If he can cut down the bad INTs, keep the TD numbers going, get a better completion percentage, and find the best open receivers most of the time then he will be very very good.
I think we need better run blocking and production than we need Stanley to really improve.